FF-I, FF-II, FF-III. All on iPod touch so I guess they are available on iPad.
I tried Inotia, but it wasnt that good. Most rpg's on these platform seems to be that kind of game you play when you have free time at school or waiting for the bus. Not the game you would play 4-5 hours everyday. They most likely get boring real quick. The 3 FF games are definitely the best I have found so for.